Shell script to copy redis keys between redis servers

redis-copy

#!/bin/sh

function usage() {
	echo "Usage: $0 <source_redis> <destination_redis> <key_pattern>"
	echo "  <source_redis> - Source server hostname"
	echo "  <destination_redis> - Destination server nostname"
	echo "  <key_pattern> - Keys to copy (Like Redis KEYS pattern)"
	exit 0
}

function main() {
	redis_cmd="redis-cli -h $source_redis"
	redis_keys=$($redis_cmd keys $keys | cut -d ' ' -f2)

	for key in $redis_keys; do
		echo "------------------"
		echo "Reading from $source_redis Redis: $key"
		doc=$($redis_cmd get $key)
		echo $doc
		echo "Writing at $destination_redis Redis"
		redis-cli -h $destination_redis set $key '$doc' || exit 1
	done
}

if [ "$#" -ne 3 ]; then
	echo '*** Wrong number of arguments ***\n'
	usage
fi

if [ "$1" == "-h" ] || [ "$1" == "--help" ]
then
	usage
fi

source_redis=$1
destination_redis=$2
keys=$3

main